Charge-controlled intelligent ammeter capable of detecting faults of built-in switches

Abstract

The invention relates to a charge-controlled intelligent ammeter capable of detecting faults of built-in switches. The charge-controlled intelligent ammeter comprises a first current transformer, a second current transformer, a first switch, a second switch, a third switch, a first resistor, a second resistor, a first voltage collection unit, a second voltage collection unit, a third voltage collection unit, a fourth voltage collection unit, a DSP, an A / D converter, a temperature sensor, a control unit and a display. According to the charge-controlled intelligent ammeter, an accurate resistance value is acquired by detecting the fluctuation of voltages at two ends of the built-in switches and flow currents at different moments, and the automatic detection of the faults of the built-in switches is realized; the on-off states of the three built-in switches are controlled through the DSP according to charge balance information of an electric user, and the reliable charge control is realized; and the fluctuation of voltages at two ends of the built-in switches and the flow currents at different moments are detected, a compensation factor of each voltage collection unit is modified in real time, and the accurate resistance value is obtained, so that the automatic detection of the faults of the built-in switches is realized.

Description

technical field [0001] The invention relates to a fee-controlled intelligent electric energy meter capable of detecting built-in switch faults, and belongs to the technical field of intelligent electric energy meters. Background technique [0002] The smart energy meter is an important part of the smart grid. It is composed of a measurement unit, a data processing unit, and a communication unit. It has functions such as electric energy measurement, data processing, real-time monitoring, automatic control, and information interaction. According to the electricity bill balance information of the electricity consumer, the fee-controlled smart energy meter can realize the power interruption and restoration of the electricity consumer by controlling the closing and closing of the built-in switch. Frequent switching can easily cause damage to the switch, resulting in unreliable action during cost control. By detecting the voltage at the two terminals of the built-in switch and th...

AI Technical Summary

Problems solved by technology

The resistance value of the built-in switch is small, and its two-terminal voltage is generally in the millivolt level, so it is difficult to accurately measure the voltage in the energy meter

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